Broad Alpha-rhythm Enhancement and Its Convergence during Sequential Memory Task
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Bibliographic record
Abstract
Alpha-rhythm enhancement during memory maintenance has been explained as active inhibition of task-irrelevant visual inputs because the enhancement is generally observed in occipital visual areas. Moreover, in a sequential memory task, items encoded at an early stage must be maintained in parallel to the encoding of subsequent memory items. To reveal the role of the alpha-rhythm in multiple memory processes, magnetoencephalograms of 14 young participants (age, mean ± SD = 21.1 ± 1.1 years) were recorded during a sequential memory task. Participants memorized seven sequentially presented arrow directions. Arrow directions were randomized in the memory trials, whereas they were fixed in the control trials. The time course was divided into four periods: beginning (0–1.2 s: 1st and 2nd arrows presented), midterm (1.2–3.0 s: 3rd–5th arrows), ending (3.0–4.2 s: 6th and 7th arrows), and maintenance (4.2–5.2 s: before recall cue presentation). The source amplitudes of the alpha-rhythm were analyzed by three-way repeated-measures ANOVA (Memory/Control × Brain region [n = 68] × Time period [n = 4]) with post hoc analysis. In many brain regions, alpha-rhythm amplitude was significantly enhanced in the Memory condition than in the Control condition. These enhancements were distributed widely across brain regions in the beginning period but gradually converged to occipital areas toward the maintenance period. Our results suggest that even if alpha-rhythm enhancement is caused by active inhibition, it is not always solely attributable to the inhibition of visual inputs. Additionally, we compared the time courses of alpha-rhythm amplitude obtained in young participants in this study with those recorded in older participants in a previous study. In the previous work, it was suggested that precuneus activity was essential for memory performance in older people. However, for the young participants in this study, precuneus activity was highly inhibited and not related to memory performance.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it